matthews



- R; B. MATTHEWS..

MACHINE PQR FAGING GRINDSTONBS.

No. 77,303. Patented Apr. 28, 1868.

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@hitch ,tat-trs' gntwt @frn Lefms'paearm. 77,303, dated April 28,1868.

IMPROVBD MAenms ron rAeINe GRINDSTONES.

-agg*- @ligtrlgehnlc referrer tu in tlgesi Enters tant mit making ont uf tige-nime.

TO ALL TO WHOM vPRESEll'-'.IS SHALL COME:

Be it known thatLI, Revenirl B. MATTHEWS, of'Eitchburg, in the county of Worcester, and State of Massa ehusetts, h ave invented a'new and useful Machine for Performing the Operation'of Faeing- Grindstones; and do hereby declare the following to be a full, clean-ondertitel'. description thereof, due reference being had to the neco mpanying drawings, mnl/.ing'part of this specification, and in whichi Figure'l is a plan,

Figure 2 a vertical central and transverse section, and

lFigure 3 a vertical central and longitudinal section of a. machine constructed in accordance with my invention;

The object sought, in making this tinvention, is to. perform thefoperation or labor ofgrinding or cutting the periphery of a grindstone te true circle, or an even face, such operation being technicallycalledfacing the stone, and new generally accomplished by an i'iron bai-,held in the hands'of a workman, and pressed against libc periphery of the revolving stone, the bar being placed against the adjacentlportioln ofthe frame supporting `thc stone, which serves as a bearing' or fulerum. for such bai', in order te enable it to be pressed in contact with 'the stone with considerable power. Y

j The ,in'vontion consistsv in a sliding carriage, rnovingupon horizontal Ways or guides,suitnbly supported,"

Iand carryinga bar o i iron at right angles toits path of movement'the necessary alternating inovemcntsor feeding of the carriage heing'ciected by bevelled gears 'and a screw, s o applied andY coinbined therewith that upon thcturning of' a crank, the-eutting-to'ol'or bar shall be caused to traverse the periphery of the stone froml right to left, and vice versa, until the circumference of 'the stone'is reduced to a circle, the cutting-bar being advanced suiiiciently fastto compensato for its avear, bya sliding tubular shaft, applied to the sliding. carriage before mentioned, and carrying one of theA screw-operating gears,i'the whole bengarranged and operating substantially as hereinafter described. v

Reference being had to the accompanying drawings, above referred to as making part lof this specilication,

it will be seen that A denotes '2t-carriage, in form `resembling that of the ordinary lathe head-stock, this carriage being supported andA sliding up'on tivo horizontal parallel shafts, all?, 'the latter being hingedto the former' byHvibratingarm-s, c c, in such manner as to allow of its being raised or lowered with 'respect thereto, for the purpose offe'eoting the horizontal adjustment of the stone-reducing tool, the journals ff of the Shaft being supported and turning at each en d in suitable standards, d d, and having a. nut, c,'screwcd upon their outer- `extremities,"which, upon being 'screwed tightly up against the standards d d, serve to maintain `the shaftaand carriage A firmlyv in place.

When it becomes desirable to change the angle of the carriage, (which the vsr'ying'sizes of stones may require) the nuts e e are to be loosened, and the necessary adjustment of such carriage effected, the nuts being subsequently tightened. The sliding carriage is composed of a suitable base, g, and upright's, 7l z'j.

A tubular male screw, k, is inserted, and so as to rcvolvewithin afemalc screw, 1,' cut through the outer upright, 7L, of the carriage A, the bore of the lscrew creeeiving and serving as a beariugto one end of a hollow revolving shaft, m, which extends through it, the outer extremity of such shaftm, as it projects bcjfond the screw k,'being provided witlra crank, a', or other suitable device for rotating it the outer end of the'sereiv k also being provided'with a hand-wheel, or its equivalent, by means ofwhich such screw is put in rotation, for the purpose of advancingor retracting the hollow shaft, and the reducing-tool or bar, which it carries, the epposite ends of'thc said screw being confined between the said-crank and a collar or rib, b', fixed to or naking part ofthe shaft m, -as shown in lig. 2 of the drawings.

This reducing-tool is shown at n, as a b'ar of iron, of a cylindricalor other proper shape, insertedwithin the bore of the shaft nz, and securely held in place thereon by a suitable chuck, do, applied to the inner end of such shaft, and between the uprights j of the frame A. i

'lhe inner extremity-of the tool n projects a short distance beyond the upright, j, thc inner .fece of which is provided with a shield, y, for protecting the workman, aswell as the working parts of the' machine, from the dustvand dirtresulting from the reduction of the circumference ofthe stone. l l

A bevelled gear, g, is applied to the hollow shaft m, and` with its shank or journal, r, revolving in a bearingmade in the upright, e', of the carriage A, the attachment of the gear to the shaft being the ordinary groove and spline, which admits of longitudinal movements of the shaft through the gear, but at the same time causing 'the two to revolve together.

The said bevelled gear g engages with second bevelled gear, s, the' shank of which revolves in a fourth uprightor standard, .1, making part of the carriage A, and secured to the inner end of a long serewg e, which is screwed through the upper part of a post, w, upheld by the shaft b, before mentioned, the post w being secured to the shaft by a set-screw, x; the object in making the pest adjustable, or movable with respect to the shaft b, being to enable the relative position of the carriage A, audits mechanism, to be moved or adjusted very quickly, should 'occasion require, as it will be obvious that upon loosening the set-serew a', the said carriage and mechanism may be moved laterally upon the shafts a b, without'the time occupied by the compara-tively slow movement Veffected by the revolution of the screw v.

The above description of the mechanical construction of my invention, taken in connection with the accompanying drawings, will enable mechanics to manufacture it.

In putting such an invention into practical use, the standards dd are to be securlely bolted or otherwise secured tothe frame ofv the grindstone, and with the inner end of the reducingftooln in immediate proximity or in contact with the grindingfface or periphery of the revolving stone. .i

I Byrevolving the crank a from right to left, or vice versa, as occasion requires, the carriage A, by means of the gears q and s and screw e, will be moved laterally( upon the shafts a and b, and consequently .the tool n will be" caused to makealternate transverse movements .across the grinding-facof the stone, and by this means reduce its circumference to a circle, the tool`being advanced at proper times, and to a sufficient extent, by means 0f the tubular screw Je, as to compensate for its wear.

The operation of facing a grindstone by the modes ordinarily adopted, is well known to be an arduous and disagreeable one, requiring the expenditure of'much manual strength to accomplish it.l

By means of my invention the work is performed, not only with the exertion of very little strength on the,

part of the workman, but in a comparatively very short space of time, this economy of time, in a large manu-A factory, being of ygreat importance. A

,The rotation ofthe cutting-end of the' tool n, effected by the revolution' of thoslihit m, causes a sharp cutting-edge to be' always presented to the face of the stone.

Having thus described my invention and its mode of operation, what I claim, or believe as novel and original with myself, and desire to secure .by Letters Patent of the United States, is as follows:

. 1. I claim applying the' carriage A, and its above-described mechanism, to the shaft a, in such manner as to be enabled to eli'ect its horizontal adjustment, or angle of departure from a horizontal line, substantially as Y beforedeseribed.

2. I claim the combination and arrangement, with the carriage A, of the tubular screw 7;, hollow shaft m,

and bevelled gear q, thewholc being arranged and operating as before set forth and explained.

3. I claim, in combination with the carriage A, screw lc, shaft nl, bevelled gear q, and shaft b, th'e scrcw'u, as-supported upon the adjustable post w, and provided with the bevelled gear s, in manner and operating-ns before set forth.

` REUBEN B. MATTHEWS. Witnesses:

Cms. 4E. Far, A. OrPLAIs'fJED. 

